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Campylobacter infection causes acute gastroenteritis. Most infections are acquired by ingestion of undercooked chicken or pork or unpasteurized milk, from handling raw poultry, or from direct contact with fecal material of infected pets or farm animals.
Cryptosporidium species are protozoa that can cause diarrheal illness in humans. The protozoa have been found in a variety of hosts such as mammals, birds, and reptiles. Outbreaks have been associated with contamination of municipal water supplies and swimming pools, as well as petting zoos.
Shiga toxin-producing E. coli (STEC) are diarrhea-causing strains of a group of bacteria called Escherichia coli. E. coli O157:H7 is the most well-known type of STEC, but there are many other types that can cause illness in humans. While STEC infection has traditionally been associated with animal products, outbreaks associated with produce have become more common.